[alt-photo] Re: tricolor gum problem

[Paul Viapiano]

A foam roller does wonders for this. Just keep rolling until the fish eyes 
are gone...


----- Original Message ----- 
From: "Don Bryant" <donsbryant at gmail.com>
To: "'The alternative photographic processes mailing list'" 
<alt-photo-process-list at lists.altphotolist.org>
Sent: Sunday, September 09, 2012 9:20 AM
Subject: [alt-photo] Re: tricolor gum problem


> Ahh the old fish eye problem.
>
> I use a badger hair brush to eliminate the gaps from the fisheyes in the
> magenta coating.
>
> I burnish the surface of the print lightly with the brush as though I was
> polishing a leather shoe or boot. This is after the fresh coating has 
> setup
> for a minute or two.
>
> Also note I ensure the magenta pigment is thoroughly blended with the gum
> and dichromate. For that I use a dremel tool with a custom stainless steel
> brush attachment which I made to quickly make a homogenous solution. But 
> do
> avoid blending to long. Extended blending will induce frothing and 
> excessive
> air bubbles.
>
> Good luck,
>
> Don Bryant
>
>
>
> -----Original Message-----
> From: alt-photo-process-list-bounces at lists.altphotolist.org
> [mailto:alt-photo-process-list-bounces at lists.altphotolist.org] On Behalf 
> Of
> jusdado
> Sent: Sunday, September 09, 2012 12:06 PM
> To: ALTERNATIVE PHOTOGRAPHY LIST
> Subject: [alt-photo] tricolor gum problem
>
> Hi all.
> After a series of prints with tricolor gum with very good results, now
> two things happen: 1. - To spread the emulsion gum, dichromate and
> magenta pigment on printing, which contains blue (cyanotype) and gum
> yellow pigment, a similar effect occurs when pour or scatter oily water
> on a surface, rather than uniformly cover, the emulsion tends to collect
> in some places and not to adhere to others. 2. - After exposure to UV
> light, the revealed, the emulsion tends to disappear, leaving the
> impression with a hideous green.
> Data: equal paper and treatment, as cyanotype, like brushes, like UV
> unit and time of exposure and processing, as dichromate and
> concentration. Similarly gum prepared as above, but in this case drops
> put carbolic acid (preservative) and Scmincke watercolor pigment PR122
> same dilution 1:10,
> What is happening?, Is there gum hardened by the action of carbolic acid?.
> Thanks for answering and sorry for my english, translation by computer.
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